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Stenogrammitis, a new genus of grammitid ferns segregated from Lellingeria (Polypodiaceae)

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Abstract

Stenogrammitis, a new genus of grammitid ferns, is segregated from Lellingeria based on morphological and molecular evidence. It differs from Lellingeria by linear leaves usually less than 5 mm wide, clathrate iridescent rhizome scales that are glabrous except for a single apical cilium, veins unbranched and only one per segment, fertile veins usually with the dark sclerenchyma visible beneath the sporangia, and x = 33. In contrast, Lellingeria has broader laminae, veins pinnate within the segments, and fertile veins not visible beneath the sporangia. Melpomene, which is sister to Stenogrammitis and Lellingeria, differs from those two genera by reddish setae on the leaves and rhizome scales papillate at the apex. Some species of Stenogrammitis are also distinctive by hemidimorphic laminae that have the fertile portion less dissected than the sterile. Stenogrammitis is pantropical and currently comprises 24 species, 12 of which occur in the Neotropics, six in Africa, four in Madagascar, and two on Pacific Islands. New combinations are made for Stenogrammitis aethiopica, S. anamorphosa, S. ascensionensis, S. boivinii, S. delitescens, S. jamesonii, S. hartii, S. hellwigii, S. hildebrandtii, S. limula, S. luetzelburgii, S. myosuroides, S. nutata, S. oosora, S. paucipinnata, S. prionodes, S. pumila, S. ruglessii, S. rupestris, S. saffordii, S. strangeana, S. tomensis, S. subcoriacea, and S. wittigiana. Lectotypifications are made for Grammitis muscosa, Polypodium itatiayense, P. oosorum var. micropecten, P. serrulatum forma major, P. serrulatum forma minor, S. luetzelburgii, S. myosuroides, and S. wittigiana. Illustrations are presented for the diagnostic characters of the genus, as well as a map with the geographical distribution.

Resumo

Stenogrammitis, um gênero novo de samambaias grammitidóides, é aqui segregado de Lellingeria com base em dados moleculares em morfológicos. Difere de Lellingeria pelas frondes lineares, geralmente com menos de 5 mm de largura, escamas do rizoma iridescentes, inteiramente glabras, ou com apenas um cílio apical, nervuras não ramificadas e apenas uma por segmento, nervuras férteis geralmente com o ápice esclerenquimatoso, negro, visível entre os esporângios, e x = 33. De maneira oposta, Lellingeria apresenta frondes mais amplas, segmentos com nervuras pinadas, e nervuras férteis não visíveis por entre os esporângios. Melpomene, que é o grupo irmão de Stenogrammtis e Lellingeria, difere destes dois gêneros por apresentar frondes setosas, e escamas do rizoma papiladas no ápice.Algumas espécies de Stenogrammitis são distintas por apresentar a lâmina hemidimorfa, com a porção fértil da lâmina menos dividida que a estéril. Stenogrammitis apresenta distribuição pantropical e compreende 24 espécies, 12 das quais ocorrem no Neotrópico, seis na África, quatro em Madagascar, e duas nas Ilhas do Pacífico. Novas combinações são feitas para Stenogrammitis aethiopica, S. anamorphosa, S. ascensionensis, S. boivinii, S. delitescens, S. jamesonii, S. hartii, S. hellwigii, S. hildebrandtii, S. limula, S. luetzelburgii, S. myosuroides, S. nutata, S. oosora, S. paucipinnata, S. prionodes, S. pumila, S. ruglessii, S. rupestris, S. saffordii, S. strangeana, S. tomensis, S. subcoriacea, and S. wittigiana. Lectotipificações são feitas para Grammitis muscosa, Polypodium itatiayense, P. oosorum var. micropecten, P. serrulatum forma major, P. serrulatum forma minor, S. luetzelburgii, S. myosuroides, e S. wittigiana. São apresentadas ilustrações para os caracteres diagnósticos do gênero, bem como um mapa com a distribuição geográfica.

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Acknowledgments

This study was funded by a grant to the senior author from the CNPq—Brazil (PDE CNPq Proc. no. 201782/2008–1), and by a grant from the United States National Science Foundation to Dr. Robbin Moran (DEB-0717056). Fieldwork was partially funded by the “Fundação O Boticário de Proteção à Natureza” (Proc. 0756/2007–2). I thank The New York Botanical Garden for providing herbarium and laboratory facilities, as well as the Curators of the following herbaria for loans: AAU, B, BM, BR, F, FR, GH, HB, HBR, K, MAPR, MBM, MICH, MO, NY, P, PACA, R, RB, S, SP, SPF, U, UC, UPCB, US, and WU. I also thank Fernando Matos for his help with the chromosome counting, and Robbin C. Moran, Alan R. Smith, Michael Sundue and Jefferson Prado for helpful comments on the manuscript. Diana Carneiro prepared the line drawings.

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  1. Universidade Federal do Paraná, Departamento do Botânica, Caixa Postal 19031, CEP 81531-980, Curitiba-PR, Brazil

    Paulo H. Labiak

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Correspondence to Paulo H. Labiak.

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Labiak, P.H. Stenogrammitis, a new genus of grammitid ferns segregated from Lellingeria (Polypodiaceae). Brittonia 63, 139–149 (2011). https://doi.org/10.1007/s12228-010-9148-y

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